Question

20. (iv) The magnetic field produced by electrical impulses in our body is
. Temporary and are very strong
b. Temporary and are very weak
Permanent and are very strong.
d. Permanent and are very weak​

Answer 1

Answer:

Permanent and are very strong.

Explanation:

Answer 2

Answer:

b) temporary and very weak

Explanation:

An electric current always produces a magnetic field. Even weak ion currents that travel along the nerve cells in our body produce magnetic fields. When we touch something. our nerves carry an electric impulse to the muscles we need to use. This impulse produces a temporary magnetic field. These fields are very weak and are about one- billionth of the earth's magnetic field. Two main organs in the human body where the magnetic field produced is significant, are the heart and the brain. The magnetic field inside the body forms the basis of obtaining the images of different body parts. This is done using a technique called Magnetic Resonance Imaging (MRI). Analysis of these images helps in medical diagnosis. Magnetism has thus, got important uses in medicine.